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025 Java Android Program to Demonstrate Touch Listener

This Android Java Program demonstrates on Touch Listener.
Here is source code of the Program to demonstrates on Touch Listener. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Main Activity

package com.example.on_touch_listener;


import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;

public class MainActivity extends Activity implements OnTouchListener {


Ourview v;
Bitmap bm;
float x,y;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
v = new Ourview(this);
v.setOnTouchListener(this);
bm = BitmapFactory.decodeResource(getResources(), R.drawable.image4);
x=0;y=0;
setContentView(v);
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
v.pause();
}

@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
v.resume();
}

// surface view is going to be a thread now
class Ourview extends SurfaceView implements Runnable {

Thread th = null;
SurfaceHolder holder;
boolean var = false;

public Ourview(Context context) {
super(context);
// TODO Auto-generated constructor stub
holder = getHolder();
}

@Override
public void run() {
// TODO Auto-generated method stub
while (var = true) {
// do stuff
if (!holder.getSurface().isValid()) {
continue;
}
Canvas c = holder.lockCanvas();// while drawing on a canvas we
// lock it and after drawing on
// it we unlock it

c.drawARGB(255, 250, 150, 20);//rgb values
c.drawBitmap(bm, x -(bm.getWidth()/2), y -(bm.getHeight()/2), null );
holder.unlockCanvasAndPost(c);
}
}

public void pause() {

var = false;
while (true) {
try {
th.join();// would pause the currently executing thread till
// the user finishes its job
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
th = null;
}

public void resume() {
var = true;
th = new Thread(this);
th.start();
}
}

@Override
public boolean onTouch(View v, MotionEvent me) {
// TODO Auto-generated method stub
//update the value of x and y on every touch so that our bitmap gets drawn with that x and y position which we just changed on clicking
x=me.getX();//ontouch listener
y=me.getY();

return true;
}

}

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